Abstract
This paper presents the design of pentagonal microstrip antenna for dual resonant frequencies at L-1 (1.575 GHz) and L-2 (1.227 GHz) with right hand circular polarization (RHCP). Designing and optimization processes took place in Zeland IE3D simulation software before the design was printed on RO4003C laminated board. Result of the Simulation shows at 1.575 GHz and 1.227 GHz, the antenna has return loss at -18.07 dB and -19.44 dB respectively.